Method of forging insulator caps



B. NELSON METHOD OF FORGING INSULATOR ,cAPs

April 2 1924. 1,491,965

Filed May '7 1923 v 2 Sheets-Sheet 1 u mmmv April 29 1924. 1,491,965

B. NELSON.

METHOD OF FORGING INSULATOR CAPS File May '7. 1923 I 2 Sheets-Sheet 2 Bar/2g Mlsoiz {7AM IX/M atto'znua Patented Apr. 29, 1924- UNITED STATES PATENT OFFICE.

BARNEY NELSON, OF CANTON, OHIO, ASSIGNOR TO THE AMERICAN FORGE AND MA- CHINE COMPANY, OF CANTON, OHIO, A CORPORATION OF OHIO.

METHOD OF FORGING- INSULATOB CAPS.

Application filed May 7, 1923. Serial No. 637,187.

To all whom it may concern:

Be it known that I, BARNEY NELSON, a citizen of the United States, residing at Canton, in the county of Stark and State of Ohio, have invented a new and useful Method of Forging Insulator Caps, of which the following is a specification.

The invention relates to metal insulator caps, used for supporting high tension conductors, and to the particular .cup shaped type in which a slotted dome and a transverse partition forms a recess for receiving and engagingthe head of a supporting bolt; and the object of the improvement is to make the ca by a forging process, as distinguishe from a casting process.

The new method of making such a cap involves the forging of a bell shaped cup with a dome on its closed end, the separate forging of a partition wall for the base of the dome, and there securing the partition wall into the cap by a forging operation.

The several steps of the process are illustrated in the accompanying drawings forming part hereof, in which igure 1 is a side elevation of an insulator showing its head and cap in section;

Fig. 2, a perspective View of a cylindric blank from which the walls of the cap may be made;

Fi 3, a sectional View of'a punch and die by w ich the walls of the cap may be initially .forged;

Fig. 4, a sectional view of a cap as the same is initially formed;

Fig. 5, a'perspective sectional view of the form in which a transverse partition may be foli'ged;

ig. 6, a plan view of a spring spider for ressing against the head of a supporting Fig. 7 a sectional view of a partition and spring placed in the initially formed cap;

Fig.8, a sectional view of a punch and die which may be employed for securing the partition in place and completing the formation of a groove in the rim of the cap;

gig. 9, a plan view of the completed cap; an

Fi 10, a fragmentary sectional view showing the method of inserting a. bolt head through the slot into the recess in the dome of the cap.

Similar numerals refer to similar parts throughout the drawings.

Such a cap may be made by initially forg- I ing from a cylindric blank 21 the exterior Wall 11 of the cup and 1 .8 of the dome; at

the same time forming the slot ted opening 15 in the dome and forming aninternal annular shoulder 22 at the base of the dome and an offset 12 at the rim of the cup; which forging may be done by a punch 23 and a die 24, as shown in Fig. 3. i

A partition plate 19 may be forged to fit into the baseof the dome upon the annular shoulder therein, as shown in Fig. 7 and is preferably provided with a rabbetted rim 25 into and upon which metal from the wall 11 of the cup may be forged to overlap the rim and press the periphery of the partition against the wall of the dome and the shoulder therein, to secure the partition in place; which may be done during the heat of the first forgings, by a punch 26 and a die 27, the shape of which may also serve to bend the rim 28 of the off-set flange 12 inward to form an internal annular recess 29 in the rim of the cup, as shown in Fig. 8.

When the spring spider 20 is used in the recess the same is entered in the dome before the partition is placed in position, as shown in Fig. 7 and -upon completion of the cap, the head 17 of a bolt 18 may be entered through the slotted opening 15 into the recess of the dome, by inclining the bolt to one side and pressing the spring downward for entering the head into the recess, as shown in Fig 10, after which the bolt may be swung into axial position, as shown in broken lines I in the same figure, whereupon the 5 ring spider will press the head upward y against the rim of the opening.

It will be understood that the partition may be forged with such a-diameter that it will fit into the cup' when the partition has been cooled and before the cup is cooled; so that the cup will shrink around the periphcry of the partition when the cup 000 s.

I claim 1. lhe method of making an insulator cap or the like, which includes forging a cup with a dome thereon, forging a. partition and placing it in the base of the dome, and forging the wall of the cup to overlap theperiphegy of the partition.

2. A method of making an insulator cap or the like which ineludes'forging a cup with a dome thereon and an annular shoulder in the base of the dome, forging a partition and placing it upon the rim in the base of the dome, and forging the wall of the cup to overla the periphery of the partition and press the same against the base of the dome and the annular shoulder.

3. The method of making an insulator ea or the like which includes for ing a cup with a dome thereon having a, s otted opening therein, placing a spring spider in the dome, forging a partition and placing it in the base of the dome and forging the Wall of the cup to overlap the periphery of the partition.

4. The method of making an insulator cap or the like, which includes forging a cup with a dome thereon, forging a partition and cooling and placing it in the base of the dome while the same is hot, and forging the wall of the cup to overlap the periphery of the partition.

BARNEY NELSON. 

